ca376ead88
This PR implements the new LES protocol version extensions: * new and more efficient Merkle proofs reply format (when replying to a multiple Merkle proofs request, we just send a single set of trie nodes containing all necessary nodes) * BBT (BloomBitsTrie) works similarly to the existing CHT and contains the bloombits search data to speed up log searches * GetTxStatusMsg returns the inclusion position or the pending/queued/unknown state of a transaction referenced by hash * an optional signature of new block data (number/hash/td) can be included in AnnounceMsg to provide an option for "very light clients" (mobile/embedded devices) to skip expensive Ethash check and accept multiple signatures of somewhat trusted servers (still a lot better than trusting a single server completely and retrieving everything through RPC). The new client mode is not implemented in this PR, just the protocol extension.
119 lines
3.3 KiB
Go
119 lines
3.3 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package les
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import (
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"context"
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"github.com/ethereum/go-ethereum/core"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/light"
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"github.com/ethereum/go-ethereum/log"
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)
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// LesOdr implements light.OdrBackend
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type LesOdr struct {
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db ethdb.Database
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chtIndexer, bloomTrieIndexer, bloomIndexer *core.ChainIndexer
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retriever *retrieveManager
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stop chan struct{}
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}
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func NewLesOdr(db ethdb.Database, chtIndexer, bloomTrieIndexer, bloomIndexer *core.ChainIndexer, retriever *retrieveManager) *LesOdr {
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return &LesOdr{
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db: db,
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chtIndexer: chtIndexer,
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bloomTrieIndexer: bloomTrieIndexer,
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bloomIndexer: bloomIndexer,
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retriever: retriever,
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stop: make(chan struct{}),
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}
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}
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// Stop cancels all pending retrievals
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func (odr *LesOdr) Stop() {
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close(odr.stop)
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}
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// Database returns the backing database
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func (odr *LesOdr) Database() ethdb.Database {
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return odr.db
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}
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// ChtIndexer returns the CHT chain indexer
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func (odr *LesOdr) ChtIndexer() *core.ChainIndexer {
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return odr.chtIndexer
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}
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// BloomTrieIndexer returns the bloom trie chain indexer
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func (odr *LesOdr) BloomTrieIndexer() *core.ChainIndexer {
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return odr.bloomTrieIndexer
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}
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// BloomIndexer returns the bloombits chain indexer
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func (odr *LesOdr) BloomIndexer() *core.ChainIndexer {
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return odr.bloomIndexer
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}
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const (
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MsgBlockBodies = iota
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MsgCode
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MsgReceipts
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MsgProofsV1
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MsgProofsV2
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MsgHeaderProofs
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MsgHelperTrieProofs
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)
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// Msg encodes a LES message that delivers reply data for a request
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type Msg struct {
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MsgType int
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ReqID uint64
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Obj interface{}
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}
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// Retrieve tries to fetch an object from the LES network.
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// If the network retrieval was successful, it stores the object in local db.
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func (odr *LesOdr) Retrieve(ctx context.Context, req light.OdrRequest) (err error) {
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lreq := LesRequest(req)
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reqID := genReqID()
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rq := &distReq{
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getCost: func(dp distPeer) uint64 {
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return lreq.GetCost(dp.(*peer))
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},
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canSend: func(dp distPeer) bool {
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p := dp.(*peer)
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return lreq.CanSend(p)
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},
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request: func(dp distPeer) func() {
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p := dp.(*peer)
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cost := lreq.GetCost(p)
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p.fcServer.QueueRequest(reqID, cost)
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return func() { lreq.Request(reqID, p) }
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},
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}
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if err = odr.retriever.retrieve(ctx, reqID, rq, func(p distPeer, msg *Msg) error { return lreq.Validate(odr.db, msg) }, odr.stop); err == nil {
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// retrieved from network, store in db
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req.StoreResult(odr.db)
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} else {
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log.Debug("Failed to retrieve data from network", "err", err)
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}
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return
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}
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